/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.example.android.apis.graphics;

import android.content.Context;
import android.graphics.*;
import android.os.Bundle;
import android.view.*;

import java.io.ByteArrayOutputStream;

public class CreateBitmap extends GraphicsActivity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(new SampleView(this));
	}

	private static final int WIDTH = 50;
	private static final int HEIGHT = 50;
	private static final int STRIDE = 64; // must be >= WIDTH

	private static int[] createColors() {
		int[] colors = new int[STRIDE * HEIGHT];
		for (int y = 0; y < HEIGHT; y++) {
			for (int x = 0; x < WIDTH; x++) {
				int r = x * 255 / (WIDTH - 1);
				int g = y * 255 / (HEIGHT - 1);
				int b = 255 - Math.min(r, g);
				int a = Math.max(r, g);
				colors[y * STRIDE + x] = (a << 24) | (r << 16) | (g << 8) | b;
			}
		}
		return colors;
	}

	private static class SampleView extends View {
		private Bitmap[] mBitmaps;
		private Bitmap[] mJPEG;
		private Bitmap[] mPNG;
		private int[] mColors;
		private Paint mPaint;

		private static Bitmap codec(Bitmap src, Bitmap.CompressFormat format,
				int quality) {
			ByteArrayOutputStream os = new ByteArrayOutputStream();
			src.compress(format, quality, os);

			byte[] array = os.toByteArray();
			return BitmapFactory.decodeByteArray(array, 0, array.length);
		}

		public SampleView(Context context) {
			super(context);
			setFocusable(true);

			mColors = createColors();
			int[] colors = mColors;

			mBitmaps = new Bitmap[6];
			// these three are initialized with colors[]
			mBitmaps[0] = Bitmap.createBitmap(colors, 0, STRIDE, WIDTH, HEIGHT,
					Bitmap.Config.ARGB_8888);
			mBitmaps[1] = Bitmap.createBitmap(colors, 0, STRIDE, WIDTH, HEIGHT,
					Bitmap.Config.RGB_565);
			mBitmaps[2] = Bitmap.createBitmap(colors, 0, STRIDE, WIDTH, HEIGHT,
					Bitmap.Config.ARGB_4444);

			// these three will have their colors set later
			mBitmaps[3] = Bitmap.createBitmap(WIDTH, HEIGHT,
					Bitmap.Config.ARGB_8888);
			mBitmaps[4] = Bitmap.createBitmap(WIDTH, HEIGHT,
					Bitmap.Config.RGB_565);
			mBitmaps[5] = Bitmap.createBitmap(WIDTH, HEIGHT,
					Bitmap.Config.ARGB_4444);
			for (int i = 3; i <= 5; i++) {
				mBitmaps[i].setPixels(colors, 0, STRIDE, 0, 0, WIDTH, HEIGHT);
			}

			mPaint = new Paint();
			mPaint.setDither(true);

			// now encode/decode using JPEG and PNG
			mJPEG = new Bitmap[mBitmaps.length];
			mPNG = new Bitmap[mBitmaps.length];
			for (int i = 0; i < mBitmaps.length; i++) {
				mJPEG[i] = codec(mBitmaps[i], Bitmap.CompressFormat.JPEG, 80);
				mPNG[i] = codec(mBitmaps[i], Bitmap.CompressFormat.PNG, 0);
			}
		}

		@Override
		protected void onDraw(Canvas canvas) {
			canvas.drawColor(Color.WHITE);

			for (int i = 0; i < mBitmaps.length; i++) {
				canvas.drawBitmap(mBitmaps[i], 0, 0, null);
				canvas.drawBitmap(mJPEG[i], 80, 0, null);
				canvas.drawBitmap(mPNG[i], 160, 0, null);
				canvas.translate(0, mBitmaps[i].getHeight());
			}

			// draw the color array directly, w/o craeting a bitmap object
			canvas.drawBitmap(mColors, 0, STRIDE, 0, 0, WIDTH, HEIGHT, true,
					null);
			canvas.translate(0, HEIGHT);
			canvas.drawBitmap(mColors, 0, STRIDE, 0, 0, WIDTH, HEIGHT, false,
					mPaint);
		}
	}
}
